Vhat argument did Southerners give in support of slave labor?

Explanation:

Defenders of slavery argued that the sudden end to the slave economy would have had a profound and killing economic impact in the South where reliance on slave labor was the foundation of their economy. The cotton economy would collapse. The tobacco crop would dry in the fields. Rice would cease being profitable.

Explanation:

the US was already allies w/ England before ww1 before they joined the war in 1917. so during the war they provided supplies to the UK. But germany was sinking the ships full of all those provisions. so the US decided to jon the war. they provided aid to the allies and fought side by side heir european brothers